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Moved link-layer addresses into endpoints.

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The link-layer addresses are now part of the connection endpoints
following the originator-responder-pattern. The addresses are printed
with leading zeros. Additionally link-layer addresses are also extracted
for 802.11 plus RadioTap.
This commit is contained in:
Jan Grashoefer 2016-06-02 01:46:26 +02:00
parent a2423f7d43
commit 50cf694aae
19 changed files with 470 additions and 442 deletions
Download patch file Download diff file Expand all files Collapse all files

36
src/iosource/Packet.cc
View file

@ -44,8 +44,8 @@ void Packet::Init(int arg_link_type, struct timeval *arg_ts, uint32 arg_caplen,
eth_type = 0;
vlan = 0;
inner_vlan = 0;
bzero(eth_src, sizeof(eth_src));
bzero(eth_dst, sizeof(eth_dst));
l2_src = 0;
l2_dst = 0;
l2_valid = false;
@ -140,8 +140,8 @@ void Packet::ProcessLayer2()
int protocol = (pdata[12] << 8) + pdata[13];
eth_type = protocol;
memcpy(eth_dst, pdata, 6);
memcpy(eth_src, pdata + 6, 6);
l2_dst = pdata;
l2_src = pdata + 6;
pdata += GetLinkHeaderSize(link_type);
@ -277,12 +277,38 @@ void Packet::ProcessLayer2()
pdata += rtheader_len;
int type_80211 = pdata[0];
int len_80211 = 0;
u_char len_80211 = 0;
if ( (type_80211 >> 4) & 0x04 )
{
//identified a null frame (we ignore for now). no weird.
return;
}
// Look for data frames
if ( type_80211 & 0x08 )
{
// Determine link-layer addresses based
// on 'To DS' and 'From DS' flags
switch ( pdata[1] & 0x03 ) {
case 0x00:
l2_dst = pdata + 4;
l2_src = pdata + 10;
break;
case 0x01:
l2_dst = pdata + 16;
l2_src = pdata + 10;
break;
case 0x02:
l2_dst = pdata + 4;
l2_src = pdata + 16;
break;
case 0x03:
l2_dst = pdata + 16;
l2_src = pdata + 24;
break;
}
}
// Look for the QoS indicator bit.
if ( (type_80211 >> 4) & 0x08 )
len_80211 = 26;

19
src/iosource/Packet.h
View file

@ -1,8 +1,6 @@
#ifndef packet_h
#define packet_h
#include <netinet/ether.h>
#include "Desc.h"
#include "IP.h"
#include "NetVar.h"
@ -53,7 +51,7 @@ public:
Packet(int link_type, struct timeval *ts, uint32 caplen,
uint32 len, const u_char *data, int copy = false,
std::string tag = std::string(""))
: data(0), eth_src(), eth_dst()
: data(0), l2_src(0), l2_dst(0)
{
Init(link_type, ts, caplen, len, data, copy, tag);
}
@ -61,7 +59,7 @@ public:
/**
* Default constructor. For internal use only.
*/
Packet() : data(0), eth_src(), eth_dst()
Packet() : data(0), l2_src(0), l2_dst(0)
{
struct timeval ts = {0, 0};
Init(0, &ts, 0, 0, 0);
@ -154,7 +152,7 @@ public:
double time; /// Timestamp reconstituted as float
struct timeval ts; /// Capture timestamp
const u_char* data; /// Packet data.
uint32 len; /// Actual length on wire
uint32 len; /// Actual length on wire
uint32 cap_len; /// Captured packet length
uint32 link_type; /// pcap link_type (DLT_EN10MB, DLT_RAW, etc)
@ -179,16 +177,15 @@ public:
uint32 eth_type;
/**
* If layer 2 is Ethernet, the source MAC address. Valid iff
* Layer2Valid() returns true.
* Layer 2 source address. Valid iff Layer2Valid() returns true.
*/
ether_addr eth_src[6];
const u_char* l2_src;
/**
* If layer 2 is Ethernet, the destiantion MAC address. Valid iff
* Layer2Valid() returns true.
* Layer 2 destination address. Valid iff Layer2Valid() returns
* true.
*/
ether_addr eth_dst[6];
const u_char* l2_dst;
/**
* (Outermost) VLAN tag if any, else 0. Valid iff Layer2Valid()